Inkjet Printer

a technology of inkjet printer and inkjet printer, which is applied in the direction of printing, other printing apparatus, etc., can solve the problems of unnecessary micro droplets (satellites) being generated, productivity being lowered in some cases, so as to suppress the generation of satellites, and reduce the amount of ink

Active Publication Date: 2014-12-25
RISO KAGAKU CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0024]According to the fifth aspect of the present invention, a driving signal with a driving waveform so as to reduce an ink amount accompanying the major ink droplets discharged from the nozzle is supplied to the inkjet head. Thus, by changing the driving waveform from a normal waveform to a satellite measure waveform, generation of a satellite can be suppressed.
[0025]According to the sixth aspect of the present invention, a driving signal with a driving waveform so as to reduce the ink amount accompanying the major ink droplets discharged from the nozzle is supplied to the inkjet head in accordance with a gap between the inkjet head and a transfer portion for transferring the sheet. Thus, by changing to a satellite measure waveform with preference for a head gap with a great influence of a satellite, generation of a satellite can be suppressed.
[0026]According to the seventh aspect of the present invention, a driving signal of such a degree that the ink is not discharged from the nozzle row other than the nozzle row discharging the ink in the plurality of nozzle rows of the inkjet head is supplied. Thus, since excessive drop of a temperature of the inkjet head and temporary stop for heating can be avoided, lowering of productivity can be prevented.

Problems solved by technology

Thus, unnecessary micro droplets (satellites) might be generated, accompanying preceding major droplets.
Since a delay is caused by this ink cooling time, productivity might be lowered in some cases.
Since a delay is caused by this ink cooling time, productivity might be lowered in some cases.

Method used

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Examples

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first embodiment

Entire Configuration of Inkjet Printer

[0050]In this embodiment, a line-type inkjet printer which has inkjet heads aligned in a direction (main-scanning direction) orthogonal to a sheet transfer direction and performs printing on a sheet transferred on a transfer path by discharging an ink from a nozzle of the inkjet head on the basis of image data will be explained as an example.

[0051]FIG. 1 is a configuration diagram illustrating a configuration of an inkjet printer 1.

[0052]As illustrated in FIG. 1, the inkjet printer 1 is provided with a side sheet-feed portion 10, an internal sheet-feed portion 20, a printing portion 30, a sheet-discharge portion 40, and a reversing portion 50.

[0053]The side sheet-feed portion 10 is provided with a sheet receiving tray 11, a primary sheet-feed portion 12, and a secondary sheet-feed portion 14. On the sheet receiving tray 11, sheets P are stacked. The primary sheet-feed portion 12 transfers only the sheet P on the uppermost position from the sheet...

second embodiment

[0176]In the first embodiment, the inkjet printer 1 which calculates the influence E on the basis of the obtained gap influence Eg, temperature influence Et, and image position influence E1 is explained as an example.

[0177]In this embodiment, moreover, the inkjet printer 1 which calculates the influence E on the basis of an applicable image influence will be described as an example.

[0178]FIG. 12 is a flowchart illustrating a processing procedure of the inkjet printer 1. In processing steps illustrated in the flowchart illustrated in FIG. 12, the same processing steps as those in the flowchart illustrated in FIG. 6 are given the same step numbers and the explanation will be omitted, and only the processing steps specific to this embodiment will be explained.

[0179]As illustrated in FIG. 12, the influence calculation portion 81a calculates the temperature influence Et (S160) and then, calculates an applicable image influence Ep (S310).

[0180]FIG. 13A is a diagram illustrating an example...

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PUM

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Abstract

An inkjet printer is provided with an influence calculation portion and a device control portion. The influence calculation portion calculates an influence indicating a degree of an influence of generation of a satellite on a printing condition. The device control portion controls discharging timing of an inkjet head so that ink is discharged in order by each row of a plurality of nozzle rows for each pixel row on a sheet as a printing target, if the influence calculated by the influence calculation portion exceeds a predetermined threshold value.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application claims benefit of priority under 35 U.S.C. §119 to Japanese Patent Application No. 2013-131395, filed on Jun. 24, 2013, the entire contents of which are incorporated by reference herein.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an inkjet printer which reduces generation of satellite without lowering productivity and performs printing.[0004]2. Description of the Related Art[0005]Inkjet printers perform printing on a recording medium by discharging ink droplets by an inkjet head and are commonly well known.[0006]An ink droplet discharged from a nozzle of the inkjet head flies in a form of leaving a trail, and a time difference and a speed difference are generated between a head portion and a tail portion of the flying droplet. Thus, unnecessary micro droplets (satellites) might be generated, accompanying preceding major droplets. The satellite adheres onto a recording me...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B41J2/045
CPCB41J2/04573B41J2/04516B41J2/04551B41J2/04563B41J2/04581B41J2/04588
Inventor SHIMODA, ASAYO
Owner RISO KAGAKU CORP
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